Please tell me that I'm not the only Frosty experiencing this..

"Pretty much self explanatory. I'm definitely hitting the targets with HB and I can see the Chillblains debuff on the target, but the Frost Fever debuff isn't always applied (to the primary or secondary targets). Can someone please look into this?

Stats are the core of your character and how you choose to balance those stats will greatly impact the effectiveness of your Frost Death Knight. Use this guide to select the stats that are the most important for your Death Knight and learn how to prioritize those stats to optimize your performance.

Stat Summaries
Melee Hit (3%) The Hit cap of 3% (1020 Rating) will eliminate the chance for any special ability to miss against other players. To check your Hit, open your character panel and then look under the Melee tab for "Hit Chance" and make sure it is at or just above 3% for your weapon(s).

Expertise (3%+) The Expertise soft cap of 3% (1020 Rating) will eliminate your attacks from being dodged or parried by caster specs/classes. To check your Expertise, open your character panel and then look under the Melee tab for "Expertise" and make sure it is at or just above 3% for your weapon(s). Expertise beyond 3% continues to reduces the chance for your attacks to be dodged or parried, but this amount of Expertise comes at the cost of other stats. It is a matter of preference and playstyle to decide how much Expertise you need to prevent parries or dodges from other players.

PvP Power Increases all damage done to players and their pets or minions, and increases healing done in PvP zones.

Strength Increases your Attack Power and the damage dealt by all of your abilities.

PvP Resilience Provides damage reduction against all damage done by players and their pets or minions. You start with a base PvP Resilience of 40%. PvP Resilience is more effective than raw Stamina for mitigating damage received in PvP environments. The choice of how much PvP Resilience to stack entirely depends on how much damage you want to mitigate versus how much damage you would like to deal to your targets. If you find yourself dying too frequently, try adding more PvP Resilience.

Crit Increases the chance for your attacks to critically hit for 200% damage.

Reforging Gear 5.1

Reforging allows you to modify the secondary stats on your gear. Use this guide to determine the best strategy for reforging your stats so that you can optimize the performance of your Frost Death Knight.

1. Check for 3% Melee Hit and 3% Expertise
If you are below 3% Melee Hit or 3% Expertise, you should reforge your weakest stats (see priority) into Hit Rating or Expertise. Do this until you are at the caps for both stats.

Gems and Enchants allow you to customize your stats and choosing the right gems and enchants is critical to developing an effective Frost Death Knight. Use this guide to view the selected best gems, enchants, and profession perks to use for your Death Knight.

5.1 Profession Perks
The recommended profession bonuses for Frost Death Knights are provided by Blacksmithing + Engineering. Blacksmithing provides two additional gem slots that can be used to help balance your stats. Engineering provides a strong on-use Strength boost in addition to other useful items.

Spec Builds & Glyphs 5.1
Talents and Glyphs give you the flexibility to tweak your Frost Death Knight for a variety of encounters. Use this guide to view the selected talents and glyphs to include in your build and under which circumstances you might need to change your build to increase your effectiveness.

This is the base PvP build for Frost Death Knights. Unholy Blight, Chilblains, and Desecrated Ground provide great utility, but may be swapped with other talents in the same tier. Lichborne and Death Pact improve your survivability. Blood Tap is the preferred Rune regen mechanic as it provides the most control over your Runes which is essential in PvP.

Major Glyphs 5.1
Major Glyphs are all highly situational. Your Glyph choices will largely depend on your team and class composition.

Since the fix that went live like few days after release never happened to me again. I'm not slotting CB unless it's pvp but never had issues applying diseases there too. Capped for 90/93.
You are sure u were capped for 92 npcs in CM ? If you were tanking, it could be the issue. Very few blood tanks are hit/exp capped unless u're in a good progress guild and can afford it.

just an update. did an lfr earlier and my plague strike debuff (blood plague) wasnt showing up. however i also track y diseases using tellmewhen and it was tracking the debuff so it may just be a UI bug for us (annnoying still).